I think i remember this one aswell, Naruto applied chakra into the rubber ball until it hurt, right?
"Once again a simple task, i only need to quintuple the amount of chakra..." Sasuke gets a good grip of the ballon, he concentrates on his chakra and on quintupling it, he moves the chakra into his right hand that is holding the ballon, he moves it at a slow pace as if he is doing it on purposes, after the chakra is in the middle of Sasukes arm, chakra immediatly bursts from around him making it visible, he channels the large amount of chakra into the ballon and concentrates it, spikes begin to form all around the ball of rubber, as Sasuke controls the chakra like the first step to make the large amount of chakra spin and move in all different directions, like a spiraling sphere, Spikes begin to appear around the rubber ballon, and it explodes "Done..."